59 lines
1.8 KiB
C#
59 lines
1.8 KiB
C#
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Input;
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using WPFDark.Internals;
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namespace WPFDark.StandardControls
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{
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public partial class ScrollViewerEventHandler
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{
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private const double Response = 150.0;
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private const double MaxOpacity = 0.6;
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private const double BarWidth = 8.0;
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private void OnPreviewMouseMove(object sender, MouseEventArgs e)
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{
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var self = ((FrameworkElement) sender).GetParent<ScrollViewer>();
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if (self is null)
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return;
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var pos = e.GetPosition(self);
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var posX = pos.X;
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var posY = pos.Y;
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var width = (1.0, self.ActualWidth - BarWidth).Max();
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var height = (1.0, self.ActualHeight - BarWidth).Max();
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if (ScrollViewerAttachedProperties.GetIsLeftVerticalScrollBar(self))
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posX = width - posX;
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var xr = (Response, width).Min();
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var yr = (Response, height).Min();
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var xir = width - xr;
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var yir = height - yr;
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var xd = NumberHelper.Clamp01((posX - xir) / xr);
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var yd = NumberHelper.Clamp01((posY - yir) / yr);
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var xo = xd * MaxOpacity;
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var yo = yd * MaxOpacity;
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ScrollViewerAttachedProperties.SetVerticalScrollBarOpacity(self, xo);
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ScrollViewerAttachedProperties.SetHorizontalScrollBarOpacity(self, yo);
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}
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private void OnMouseLeave(object sender, MouseEventArgs e)
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{
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var self = ((FrameworkElement) sender).GetParent<ScrollViewer>();
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if (self is null)
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return;
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ScrollViewerAttachedProperties.SetVerticalScrollBarOpacity(self, 0.0);
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ScrollViewerAttachedProperties.SetHorizontalScrollBarOpacity(self, 0.0);
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}
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}
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}
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